312B-4/-5 Station Control

THE COLLINS 312B-4/5 STATION CONTROL

The 312B-4 and 312B-5 Station Controls. Contains a
directional coupler and wattmeter, a speaker,
a phone patch, and appropriate switching circuitry.
The same types of directional coupler and wattmeter,
phone patch, and speaker are used in both the 312B-4
and 312B-5. In addition, the 312B-5 contains an
auxiliary variable frequency oscillator to provide
separate transmit and receive frequencies when used
with the KWM-2 or KWM-2A Transceivers.

The wattmeter indicates power levels within the ranges
of 0 to 200 or 0 to 2000 watts, forward or reflected.
It is accurate over the range of 2 to 30 MHz, but should
not be used on higher frequencies. The phone patch
includes circuitry which allows VOX phone patch
operation. It can also be switched manually if desired.
The vfo in the 312B-5 is the same as that used in
KWM-2/2A and S/Line equipment. Switching circuits
are provided to allow operation of KWM-2/2A
Transceivers on different transmit and receive
frequencies or transmit-receive operation on the same
frequency using either vfo.